Landeroceras is a genus of straight shelled cyrtogomphoceratid from the Middle Ordovician Big Horn dolomite of Wyoming.

The shell of Landeroceras is a subcylindrical brevicone with the siphuncle on one side, determined as ventral.

Connecting rings are thick, septal necks cyrochoanitic to recumbent, bullettes markedly swollen.

Landeroceras is at the end of a small offshoot within the discosorid family Cyrtogomphoceratidae that also includes Cyrtogomphoceras, and not in the line which gave rise to the Phragmoceratidae.

This article related to an Ordovician animal is a stub.